I sure hope this new motor will knock my socks off. The 6.4 isn't bad, but as its been said, it is in fact a transition motor. It could be so much more without all the emissions. I would hope they, being whoever is building it, can get it to do at least 23 mpg. I could get 21 out of my 7.3 manual. I think that as long as more emissions bills don't come creeping up, and they have sufficient time to design/build, this new one will pass with flying colors. As far as the Powerstroke name, they had better friggin keep it!!